User blog comment:Uncodify/Emulators/@comment-35002745-20180701042415/@comment-35468293-20180705053751

I hate the r4 flashcards. People just buy them, dump 30 games from online on them, and sell them for 30 bucks online. You could also just switch between micro SD cards and place whatever you wanted inside. Some idiot put tons of DS games on a large amount of storage and sold it for around 100 bucks when the SD card itself was 20. The only upside is that Nintendo helps prevent this by making features put on flashcarts unusable. A Pokemon White 2 that was modified by Nintendo couldn't level up your Pokemon any further than the one you caught it in and Pokemon Heart Gold had the infrared Pokewalkers, so you couldn't connect to fake cards.

and ds emulators are actually decent, i've seen tons of youtubers playing heartgold on those things.